Johnston
Pacific/Johnston
Time zone identifier: Pacific/Johnston
Current civil offset: -10:00 (HST)
Current DST state: Observing Standard Time
First standard time adoption: Adopted on 1896-01-13
Local Mean Time (LMT): -10:31:26 based on geographic meridian
Total recorded transitions: 7 transitions across 4 distinct offsets
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Historical Offset Step Chart (1880 to Present)
Text summary: Pacific/Johnston shifted between 4 distinct offsets from 1896-01-13 through the modern era.
Complete Transition History (7 Transitions)
| UTC Instant | Local Wall Time | Shift | Abbreviation | DST | Effect |
|---|---|---|---|---|---|
1896-01-13T22:31:26Z | 1896-01-13 12:01:26 | -10:31:26 → -10:30 | HST | No | gap |
1933-04-30T12:30:00Z | 1933-04-30 03:00:00 | -10:30 → -09:30 | HDT | Yes | gap |
1933-05-21T21:30:00Z | 1933-05-21 11:00:00 | -09:30 → -10:30 | HST | No | overlap |
1942-02-09T12:30:00Z | 1942-02-09 03:00:00 | -10:30 → -09:30 | HWT | Yes | gap |
1945-08-14T23:00:00Z | 1945-08-14 13:30:00 | -09:30 → -09:30 | HPT | Yes | offset-only |
1945-09-30T11:30:00Z | 1945-09-30 01:00:00 | -09:30 → -10:30 | HST | No | overlap |
1947-06-08T12:30:00Z | 1947-06-08 02:30:00 | -10:30 → -10:00 | HST | No | gap |
Notes from the Maintainers
Years on Record
Methodology Note: The 1970 Rule
tzdb guarantees accuracy for timestamps from 1970 onwards. Transitions prior to 1970 represent best-effort historical reconstructions.
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